Why are the sides of plastic storage containers sloped?

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Most large plastic storage containers like those produced by sterilite have sloped sides so that the top is wider than the base. This of course means that when placed side by side there is a large gap between them of wasted space. Is there a reason for this? Easier to manufacture? Structural integrity?

Edit: Thank you very much to all of you for your responses!

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14 Answers

Anonymous 0 Comments

To add to all of this, a lot of cheaper plastics are made from flat sheets drawn by vacuum or pressure into a hot mould, this is called Thermoform. It’s a cheaper method than injection moulding especially when it comes to setup costs and requires a minimum slope angle to ensure holes don’t form when the hot sheet is drawn.

Source: packaging development for food

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